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1The author is primarily concerned with discussing A.crystalline solids and their behavior at different temperaturesB.molten materials and the kinetics of the formation of their crystalline structureC.glassy metals and their structural characteristicsD.metallic alloys and problems in determining their density 参考答案： C 本题是一道中心主旨题。本文的中心主旨句是首段的第二句，该句中的“these materials”指的就是首段第一句中的“amorphous metallic alloys or glassy metals”。可见本题的正确答案应该是C。考生一定要知道：破解中心主旨题的关键在于抓住全文的中心主旨句。----------------------------------------2The author’s attitude toward the prospects for the economic utilization of glassy metals is one of A.disinterest. B. impatienceC.optimismD.apprehension 参考答案： C 本题是一道审题定位题。根据题干中的“prospects”(前景)可将本题的答案信息迅速确定在尾段，因为尾段首句中的“promising”（有前途的）暗示本段讲某种事物的前景或未来。本题的确切答案信息来源在尾段的最后一句，该句中的“that is likely to be overcome”暗示本题的正确答案是C。考生在解题时一定要具备迅速地审题定位能力，还要具备理解原文深层含义的能力。----------------------------------------3According to the text, which of the following determines the crystalline structure of a metallic alloy? A.At what rate the molten alloy is cooledB.How rapid the rate of formation of the crystalline phase is. C.How the different-sized atoms fit into a dense random-packed structureD.What the alloy consists of and in what ratios 参考答案： D 这是一道细节推导题。根据题干中的“crystalline structure”可将本题的答案迅速确定在第二段的首句，该句中的“depends on”和题干中的“determines”相互呼应。通过仔细理解第二段的首句可推导出本题的正确选项是D。请考生注意原文中“composition”和选项中“consists of”的转换。考生在解题时一定要具备细节推导能力，不能只停留于文字的表面含义。----------------------------------------4Which of the following best describes the relationship between the structure of liquid metals and the structure of glassy metals, as it is presented in the text? A.The latter is an il
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